Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/eduni/namespaces/1.1/005.xml
<?xml version="1.1"?> <!-- Illegal use of prefix that has been unbound --> <foo xmlns:a="http://example.org/namespace"> <a:bar xmlns:a=""/> </foo>
